How do I best go about to restrict access to a custom made group that I have added with two members of the guild. These two (and more added to the group in the future) needs to have access to this one module only?

Normally I restrict by $this -> register_command("all", "module", "MEMBER", array('add' => 'ADMIN', 'del' => 'MEMBER') but in this case I don't wont to give the group ADMIN rights as that will also give them way too much other rights, is there an easy check I can do for $name IN that custom group of mine?

** EDIT **
I also use in my code sometimes this check, but I can't use this for the the two persons in the custom group as I presume this command only return/works with OWNER;SA;ADMIN;LEADER and so on!

if ($this -> bot -> core("security") -> check_access($name, $this -> bot -> core("settings") -> get('Events', 'Extended')) AND ($origin==tell))
Sometimes I inside the code also us


Thanks in advance!